Belladonna/Opium suppository not dissolving, any ideas?

.Belladonna/Opium - My father has bladder cancer. Doctor prescribed the belladonna and opium suppository, but the problem is it is not disolving. Came out whole after six hours. The manufacurter said to run under warm water. Still not working. They also said he is probably dehydrated, but he is better in that respect. Any ideas?